Supernova Remnants with Mirror Dark Matter and Hyperons

TL;DR

This paper investigates how mirror dark matter influences supernova remnants by using relativistic mean-field models, revealing effects on mass, radius, deformability, and internal particle distributions.

Contribution

It introduces a novel two-fluid model incorporating mirror dark matter into supernova remnant simulations using density-dependent RMF approximation.

Findings

Dark matter reduces remnant maximum mass and radius

Dark matter heats the remnant matter and alters particle distributions

Dark matter decreases isospin asymmetry and increases sound speed

Abstract

For the first time, we use relativistic mean-field (RMF) approximation with density-dependent couplings, adjusted by the DDME2 parameterization, to investigate the effects of dark matter on supernova remnants. We calculate the nuclear equation of state for nuclear and dark matter separately, under the thermodynamic conditions related to the evolution of supernova remnants. A mirrored model is adopted for dark matter, and its effect on remnant matter is studied using a two-fluid scenario. At each stage of the remnant evolution, we assume that dark and ordinary matter have the same entropy and lepton fraction, and a fixed proportion of dark matter mass fraction is added to the stellar matter to observe its effects on some microscopic and macroscopic properties of the star. We observe that dark matter in the remnant core reduces the remnant's maximum mass, radius, and tidal deformability. Moreover, dark matter heats the remnant matter and alters particle distributions, thereby decreasing its isospin asymmetry and increasing the sound speed through the matter.